 Anyone who taught martial arts in Tianjin City had to have real fighting skill.Gao's main source of income was teaching martial arts classes so his class structure was designed to teach anyone who wanted to learn.His public classes contained multiple levels, each level of study costing more money; some students only wanted to learn Baguazhang for health, others for show, some could not afford to learn more than what was taught in the basic class and still others wanted fighting skill.